A. Symposium on Surface Molecules in Leukocyte Interactions.- The Leukocyte-Common Antigen (L-CA) Family.- The Poly-Ig Receptor — Functional Aspects of Secretory Component Expression.- Lymphocyte Migration Molecules.- The Binding of Antigen Presenting Cells to T Lymphocytes.- B. 9th Germinal Centre Conference.- Bone Marrow, B-Cell Differentiation and the B-Cell System.- In Vivo Localization of B Lymphocyte Progenitor Cells in Mouse Bone Marrow.- Pattern of Distribution of Early B Lineage Cells in Rat Bone Marrow.- B Cell Precursor Populations in Fetal and Neonatal Rat Liver: Frequency, Topography and Antigenic Phenotype.- Rat Immununoglobulin Genes Have Comparable Patterns of JH Rearrangement in Normal Peripheral B Cells and in Pre-B and Cultured TdT+ Cells from Bone Marrow.- Chicken B Lymphocyte Differentiation: Bursal Microenvironment and Differences in Ontogeny Between Normal and SPF Birds.- Response of the Chicken Bursal Stroma to Treatment with Cyclophosphamide and IDB Virus.- Age-Dependence of Lymphocyte Production in Peyer’s Follicles in Contrast to the Other Peyer’s Patch Compartments and the Thymus.- Migration of Newly-Produced Virgin B Cells from Bone Marrow to Secondary Lymphoid Organs.- Memory B Cells Generated in T CellDependent Antibody Responses Colonise the Splenic Marginal Zone.- Marginal Zone B Cells and the Localisation of Antigen on Follicular Dendritic Cells.- CBA/N Mice Have Marginal Zone B Cells with Normal Surface Immunoglobulin Phenotype.- Thymus-Independent Type 2 Responses in Lymph Nodes.- Both Ly-1 B Cells and Conventional B cells Make Autoantibodies to Bromelain-Treated Autologus Erythrocytes.- IgG Subclass Distribution in Juvenile Human Tonsil: IgG3 and IgG4 Results of Specific Antibody Production Using Synthetic Peptides.- Interrelationships of Cell-Substrate and Cell-Cell Adhesion Structures in B-Chronic Lyraphocytic Leukemia (B-CLL) Cells.- Heterogeneity in the Expression of B-Cell Antigen in Non-Hodgkin’s Lymphoma.- Growth Requirements of SJL Lymphomas In Vitro: Effect of BCGF II.- The Role of Follicular Dendritic Cells and Germinal Centers in Immune Reactions.- Morphological Diversity of DRC-1 Positive Cells; Human Folicular Dendritic Cells and their Relatives.- Identification of Alkaline Phosphatase Positive Cells in Human Germinal Centres as Follicular Dendritic Cells.- Isolation of Follicular Dendritic Cells From Human Tonsils and Adenoids. In Vitro Culture.- Immunohistochemical Study on Cultured FDC-C Enriched Lymphoid Cell Populations.- Interactions Between Follicular Dendritic Cells and Lymphoid Cells.- Deposits of Terminal Complement Complex and S-Protein on Follicular Dendritic Cells in Human Lymphoid Tissue.- Transport of Immune Complexes from the Subcapsular Sinus into the Lymph Node Follicles of the Rat.- FDC-Iccosome Mediated Antigen Delivery to Germinal Centre B Cells, Antigen Processing and Presentation to T Cells.- Is the Survival of Memory B Cells Dependent on the Persistence of Antigen?.- Memory B Cells but Not Virgin B Cells are Activated in Germinal Centers.- A Subpopulation of Germinal Center B Cells Differentiate Directly into Antibody Forming Cells Upon Secondary Immunization.- Specific Antibody Forming Cells in Lymphoid Follicles of Spleen: An Aspect of the Late Immune Response.- Enrichment of Germinal Centre Cells.- The Germinal Center Precursor Cell is Surface ? and ? Positive.- Surface IgD Phenotype of Rat Germinal Centre Precursor Cells.- The De Novo Generation of Germinal Centers is an Oligoclonal Process.- Changes in the Germinal Centre and Lymphocytic Corona After Peritoneal Inflammation.- Thymus, T-Cell Differentiation and the T-Cell System.- The Cholinergic and Adrenergic Innervation of the Rat Thymus.- Complex Heterogeneity of the Thymic Stroma.- Thymic Stromal Elements Defined by M. Abs: Ontogeny, and Modulation In Vivo by Immunosuppression.- Kinetics of Rat Thymic Dendritic Cells in Bone Marrow-Reconstituted Radiation Chimeras.- Allogeneic Cultured Thymic Fragments in Congenitally Athymic (Nude) Rats.- Studies on Thymic Involution: Growth Potential and DNA Repair of the Stromal Cells.- Production of Interleukin 1 (IL1) by Human Thymic Epithelial Cells (TEC).- A Low Density Fraction of Bone Marrow Cells Enriched in Prothymocyte Activity.- Kinetics of Thymocyte Regeneration in Adult Adriamycin Treated Rats: Evidence for a Bone Marrow Derived Prothymocyte Precursor.- A Study of Early Events During T Cell Differentiation in Thymic Grafted Nude Mice.- Vascular Thymustransplantation in Rats: A New Method to Study Thymocyte Kinetics.- M Receptor and Differentiation of T Lymphocytes in the Developing Human Thymus.- Homing Receptor Expression in Grafts of Purified Thymic Epithelium.- In Vitro Binding of L3T4?Lyt-2? P9P-1+ Thymocytes to Thymic Accessory Cells.- Interactions Between Lymphoid Cells and a Thymic Stromal Cell Line In Vitro.- Structural and Cellular Changes in the Mouse Thymus During Pregnancy.- Analysis of Lymphocyte Phenotype in Human Thymomas.- Thymic Hyperplasia in Myasthenia Gravis: Immunohistological Abnormalities and Responsiveness to Recombinant IL2.- Thymus Homing and Reconstitution in Split Dose Irradiated Preleukemic Mice.- Synovial T Cells Detect Polymorphism of Class II HLA Antigens.- Activated Inflammatory T Lymphocytes in Rheumatoid Synovitis — Effect of Cyclosporine A and Anti-TAC.- Inhibition of Splenic T Lymphocytes and Accessory Cell Interaction by Anti-Mac-1 (Monoclonal Antibody to Complement Receptor Type 3 ).- Mycobacterium Tuberculosis Antigen Specific Human T-Cell Lines are Cytolytic to Autologous Antigen Pulsed Macrophages.- Correlation of IL2 Production and Lymphoid Tissue Make-Up in Two Inbred Strains of Rats.- P145-MR6: A Novel T Cell Surface Molecule with a Role in Tolerance to Self.- Cell Types Involved in Non-Adaptive or Natural Immunity.- Suppression of Immunoglobulin Production by Germinal Centre HNK-1+ CD3+ Cells.- Mast Cell Response to Tumor Graft.- Interleukin-2 Induced Changes in Mononuclear Cell Surface Charge.- The Target Cells for Rat NK Cells Among Allogeneic Bone Marrow Cells.- Are Lymphokine Activated Killer Cells a Possible Form of Leukaemia Immunotherapy?.- Blood Leukocyte Natural Killer Activity as an Early Diagnostic Indicator of Leukaemic Relapse.- Proliferation of Large Granular Lymphocyte in the Rat.- Cell Traffic in the Immune System.- Establishment of Lymph Node Derived Endothelial Cell Lines which Show Lymphoid Cell Binding.- The Expression of Lymphocyte Adhesion Molecules on Cultured High Endothelial Cells.- Expression and Regulation of an Antigen Specific for Endothelium Involved in Human Lymphocyte Homing.- Changes in Lymphocyte Binding and Expression of His 22 of High Endothelial Venules in Rat Lymph Nodes After Occlusion of Afferent Lymph Flow.- Regulation of Functional and Morphological Aspects of High Endothelium in Mouse.- Substance P-Mediated Modulation of the Primary-Antibody Response.- MEL-14 and LFA-1, Organ Specific and Non-Specific Adhesion Molecules Involved in Homing of Human Lymphocytes.- Homing Receptor Expression and Migration of Activated Lymphocytes.- Reversibility of Loss of Homing Receptor Expression Following Activation.- Endocytic Stripping of Ligand from Migrant Lymphocytes in High Endothelial Venules (HEV): Implications for Immunomodulation vs viral Pathogenesis.- Xenogeneic Lymphocyte Migration in the Foetal Lamb and Unsuckled Neonatal Piglet: Evidence for the Evolutionary Conservation and Heterogeneity of Migration Determinants.- HEV Development and Trypsin-Inhibitable Localization of Lymphocytes in the Reaction to Intradermal PHA: A Receptor-Dependent Immigration and Possible Model for Peripheral CMI Reactions?.- The Migration of Lymphocyte Subsets from Blood to Lymph in the Normal rat.- The Physiological Role of the Lung in Lymphocyte Migration.- Lymphocyte Emigration from the Ovine Thymus: Characterization of Lymphatic Emigrants and Venous Emigrants.- T Lymphocyte Precursors Migrate Towards Chemotactic Peptides Secreted by Embryonic or Juvenile Thymus.- Microvasculature of the Sheep Thymus.- Tissue Localization and Migration of Murine Spleen Macrophages Carrying the Forssman Glycosphingolipid Antigen.- Migration Patterns of Dendritic Cells in the Mouse.- A Monoclonal Antibody which Reacts Specifically with a Population of Bovine Lymphocytes Lacking B Cell and T Cell Markers.- Secretory Immunity.- Meckel’s Diverticle: A Gut-Associated Lymphoid Organ in Chickens.- Subpopulations of Non-Lymphoid Cells in Bronchus Associated Lymphoid Tissue and Lung of the Mouse.- Migration and Lodging of Peyer’s Patch IgA Precursor Cells in the Gut Lamina Propria.- Localization, Isolation and Histochemical Characterization of Macrophages in the Gut and Mesenteric Lymph Nodes of the Rat.- Direct Transdiaphragmatic Traffic of Peritoneal Macrophages to the Lung.- Quantification and Class Distribution of Immunoglobulin-Secreting Cells in Mucosal Tissues of the Chicken.- The Identification of Murine Peyer’s Patch T Cell-Derived Factors which Enhance IgA Responses.- Role of the Galt Contrasuppressor T Cell Circuit in Isotype-Specific Immunoregulation.- Evidence for Contrasuppression in Patients with Crohn’s Disease.- Activated Fc Alpha T Cells in Crohn’s Disease are involved in Regulation of IgA.- Induction of a Combined Mucosal and Systemic Anti-Ovalbumin Response.- Differential Expression of Epithelial MHC Class II Determinants (HLA-DR, -DP, and -DQ) and increased Class I Expression in Inflamed Salivary Glands.- Jejunal Epithelium of Patients with Coeliac Disease shows Enhanced Expression of MHC Class II Subregion Products.- T Cells and Epithelial Expression of HLA Class II Determinants in Relation to Putative M Cells of Follicle-Associated Epithelium in Human Peyer’s Patches.- Modulation of Histamine Secretion from Rat and Human Mast Cell Subpopulations.- Bacterial Characteristics and Follicle Surface Structure: Their Roles in Peyer’s Patch Uptake and Transport of Vibrio Cholerae.- Mucosal Priming Alters Pathogenesis of Rift Valley Fever.- J Chain is Expressed by more IgA2 than IGA1-Producing Cells in Colonie Mucosa, but it is Reduced in Both Subclasses in Inflammatory Bowel Disease.- Antigen Presentation and Cellular Interactions in Initiation and Regulation of Immune Responses.- Ontogeny of Macrophages and Dendritic Cells of the Rat.- Postnatal Development of Non-Lymphoid and Lymphoid Cell Populations In Situ in Diabetes-Prone.- Immunological Characteristics of Milky Spots in the Omentum of Rats.- Lymphoid Dendritic Cells in Rheumatoid Tissue and Normal Blood — Characteristics and Functions.- Interdigitating Cells and Dendritic Cells of the Mouse Identified by Monoclonal Antibodies. Interaction with Lymphocyte Subsets.- Phenotypic Changes in Cultured Rat Dendritic Cells: Expression of IL-2 Receptor, Thy-1 and Other Antigens.- Lymph Node Macrophage Heterogeneity: A Subpopulation Fails to Express Activation Phenotype.- Induction of the Expression of an FcR for Monometric Rat IgG2b on Rat Peritoneal Macrophages.- Activation of Mononuclear Phagocyte Functions by Structurally Different Bacterial Endotoxins.- Expression and Function of MHC Class II Antigens on Macrophages and Dendritic Cells.- Induction of Class II MHC Antigen Expression in Rat Organs After Systemic Application of Recombinant Gamma Interferon.- Human Peritoneal Macrophages Enhance HLA-DR Expression in Culture and are Very Potent Stimulators of an Allogeneic Mixed Leukocyte Reaction.- The Effects of Bacterial Lipopoly-saccharide (LPS) on High Endothelial Venules, T Lymphocytes and Interdigitating Cells in Mouse Lymph Nodes.- Intestinal Uptake of Carrageenan: Distribution and Effects on Humoral Immune Competence.- Carrageenan Induced Changes in the Immunomodulatory Capacity of Macrophages: An In Vitro Study.- Immunoregulation in Epidermis: Glucocorticoids Induced Epidermal Cell Derived Inhibitor of Interleukin 1 Activity.- Monocyte Defect Causes Decreased AutoMLR in Multiple Sclerosis Patients.- Morphological Studies on Mitogen and Antigen Presentation by Human and Rabbit Cells.- Physical Interaction Between Dendritic Cells and Lymphocytes is not LFA-1 Mediated.- The Involvement of T-cells in the Stimulatory Effect of a Water-in-Oil Emulsion on the B-Cell Response.- Impact of IgD Receptor-positive T-Cells on the Immune Response.- Spectrotype Modulation of BALB/C Anti (1-3>) Dextran 1355S Responses.- B Lymphoma Cells Process and Present Their Endogenous IG: Implications for Network Theory.- Germinal Center B Cells Present Antigen Obtained In Vivo to T Cells In Vitro and Stimulate Mixed Lymphocyte Reactions.- Characterization of Cell Populations, Reappearing in the Mouse Spleen After Elimination by Liposome Encapsuled Dichloromethylene Diphosphonate: Reappearance of Marginal Zone Lymphocytes is Independent of Marginal Zone Macrophages.- Localization of TI2 Antigen (Ficoll-FITC) and Corresponding Specific Anti-FITC Antibody Forming Cells in the Rat Spleen.- In Vitro Infection of Human Epidermal Langerhans Cell with HIV.- Accessory Cell Neoplasia as a Result of the Breakdown of Immunological Regulation?.